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Proceedings of the International Academy of Ecology and Environmental Sciences, 2014, 4(4): 134-147
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Article

Assessment of aerosol-cloud-rainfall interactions in Northern Thailand

V. Tuankrua1,2, Piyapong Tongdeenog3, Nipon Tangtham4, Prasert Aungsuratana5, Pongsak Witthawatchuetikul6
1Graduate School, Kasetsart University, 50 Phaholyothin rd., Chatuchak, Bangkok, 10900, Thailand
2Center for Advanced Studies in Tropical Natural Resources, Kasetsart University, 50 Phaholyothin rd., Chatuchak, Bangkok, 10900, Thailand
3Department of Conservation, Kasetsart University, 50 Phaholyothin rd., Chatuchak, Bangkok, 10900, Thailand
4Forestry Research Center, Kasetsart University, 50 Phaholyothin rd., Chatuchak, Bangkok, 10900, Thailand
5Bureau of Royal Rainmaking and Agricultural Aviation, BangKhen, Bangkok, 10900, Thailand
6Watershed Conservation and Management Office, Department of Natural Parks, Wildlife and Plant Conservation, BangKhen, Bangkok, 10900, Thailand

Received 1 July 2014;Accepted 8 August 2014;Published online 1 December 2014
IAEES

Abstract
Biomass burning in the northern Thailand probably provides strong input of aerosols into the atmosphere, with potential effects on cloud and rainfall, over an entire burning season. This research was focus on effect of biomass burning aerosols on clouds and rainfall using multiple regression analysis and AOT for indicating aerosol concentrations from satellite MODIS (Terra / Aqua) and AERONET station since 2003-2012. The results indicated that average AOT of the Northern Thailand showed the highest value in pre-monsoon season especially in March with 0.5 unit less and decreased in June to July. It corresponded with hotspot data were mostly occurring in pre-monsoon season. Furthermore, almost all of the aerosols that were found during monsoon season as the big particles, caused by salt spray combine with water vapor. In the other hand, almost all of the aerosols during pre-monsoon were the small particles which come from the black carbon caused by biomass burning. There was high positive relationship with rainfall with cloud water content (CWC) and cloud fraction (CF), but it was found that were negative relationship with aerosol optical thickness (AOT) and hotspot (HP). There was moderate relationship between rainfall amount with AOT, cloud fraction (CF), cloud water content (CWC) and hotspot (HP) in all provinces of the northern Thailand. It was noticed that in any year there were the high biomass burning aerosols which caused rain later than usual about 1-2 months.

Keywords aerosols;AOT;cloud;rainfall;northern Thailand.



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